传值接值，php文件互联

echo '<pre>';
print_r($_POST);//接post传值
print_r($_GET);//接get传值
print_r($_REQUEST);///接post传值或者get传值
print_r($_SERVER);
超级链接传值用的是get方法 $get,$request
  1. <a href="ll.php?name=李四&age=20&psw=123">注册</a>
get传值在标题栏显示账号密码不安全
session 会话，只要是登陆，验证码用的比较多
1.<?php
session_start();
$_SESSION['user']='admin';
先执行admin
2.session_start();//在当前网页的第一行开始
if(!isset($_SESSION['user'])){
echo '请去登陆';
}else{
echo '欢迎：'.$_SESSION['user'];
}

  1. <?php
  2. session_start();
  3. if(isset($_POST['checkcode'])){
  4. 	if($_POST['checkcode']==''){
  5. 		echo '请填写验证码';
  6. 	}else if($_POST['checkcode']==$_SESSION['code']){
  7. 		echo '验证码输入正确';
  8. 	}else{
  9. 		echo '验证码有误';
  10. 	}
  11. }else{
  12. 	echo 'no';
  13. }
验证验证码是否错误
  1. <!DOCTYPE html>
  2. <html>
  3. <head>
  4. 	<meta charset="utf-8">
  5. 	<title></title>
  6. 	<meta name="keywords" content="关键字">
  7. 	<meta name="description" content="简介">
  8. 	<link rel="stylesheet" type="text/css" href="index.css">
  9. 	<script src=""></script>
  10. </head>
  11. <body>
  12. <form action="reg.php" method="post">
  13. 姓名： <input type="text" autofocus name="user"><br>
  14. 密码： <input type="password" name="psw"><br>
  15. 验证码：<input type="text" name="checkcode">
  16. <img src="inc/c.php"><br>
  17. <input type="submit" value="提交">
  18. </form>
  19. </body>
  20. </html>

c.php
<?php
include 'i.php';
check();
i.php
  1. <?php
  2. function check($len=4){
  3. 	session_start();
  4. 	header('content-type:image/png');
  5. 	$fs = ['/a.ttf','/b.ttf','/f.ttf'];
  6. 	$font = dirname(__FILE__).$fs[mt_rand(0,1)];
  7. 	$w = 35*$len;
  8. 	$h = 50;
  9. 	$i = imagecreatetruecolor($w,$h);
  10. 	$c = imagecolorallocatealpha($i,0,0,0,127);
  11. 	//imagecolortransparent($i,$c);
  12. 	//imagefill($i,0,0,$c);
  13. 	imagefilledrectangle($i,0,0,$w,$h,gc($i,'ffffff',mt_rand(0,2)));
  14. 	$sss = '';
  15. 	for($j=0;$j<$len;$j++){
  16. 		$st = gs(1);
  17. 		$sss.=$st;
  18. 	   imagettftext($i,mt_rand(15,25),mt_rand(-30,30),$j*35+10,mt_rand(28,38),gc($i),$font,$st);
  19. 	}
  20. 	$_SESSION['code'] = $sss;
  21. 	imagesetthickness($i,mt_rand(2,8));
  22. 	for($j=0;$j<mt_rand(5,10);$j++){
  23. 		imagefilledarc($i,mt_rand(0,$w),mt_rand(0,$h),mt_rand(0,$w),mt_rand(0,$h),mt_rand(0,360),mt_rand(0,360),gc($i,'rand',mt_rand(100,120)),IMG_ARC_NOFILL);	
  24. 	}
  25. 	for($j=0;$j<10;$j++){
  26. 	   imagettftext($i,mt_rand(10,15),mt_rand(-5,5),mt_rand(0,$w),mt_rand(0,$h),gc($i,'rand',mt_rand(100,120)),$font,gs(1));
  27. 	}
  28. 	imagepng($i);
  29. 	imagedestroy($i);	
  30. }
  32. function gs($n=4){
  33.     $s = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';	
  34. 	$t = '';
  35. 	for($i=0;$i<$n;$i++){
  36. 		$t.=substr($s,mt_rand(0,strlen($s)-1),1);
  37. 	}
  38. 	return $t;
  39. }
  41. /**
  42.  *  生成缩略
  43.  */
  44. function thumb($i,$f=false,$w=220,$h=0,$fn='s_'){
  45. 	$ii = getimagesize($i);
  46. 	if($ii[2]==2){
  47. 		if($ii[0]>$w){
  48. 		    $src = imagecreatefromjpeg($i);
  49. 			$sw = $ii[0];
  50. 			$sh = $ii[1];
  52. 			$h = $h==0 ? $w/$sw*$sh : $h;
  53. 			//建立新的缩略图
  54. 			$dst = imagecreatetruecolor($w,$h);
  55. 			imagecopyresampled($dst,$src,0,0,0,0,$w,$h,$sw,$sh);
  56. 			if($f){
  57. 				imagejpeg($dst,$i);
  58. 			}else{
  59. 				$path = dirname($i).'/';
  60. 				$name = $fn.substr($i,strrpos($i,'/')+1);
  61. 				imagejpeg($dst,$path.$name);			
  62. 			}
  63. 			imagedestroy($dst);
  64. 			imagedestroy($src);
  65. 		}
  66. 	}
  67. }
  69. /**
  70.  * 功能：生成水银图标，水银图标文件在inc目录中 名称 logo.png
  71.  */
  72. function logo($i,$p=5,$f=true,$fn='logo_'){
  73. 	$ii = getimagesize($i);
  74. 	if($ii[2]==2){
  75. 		if($ii[0]>300){
  76. 		    $ni = imagecreatefromjpeg($i);
  77. 			$w = $ii[0];
  78. 			$h = $ii[1];
  79. 			
  80. 			//水银图标 logo.png 格式
  81. 			$logo = dirname(__FILE__).'/logo.png';
  82. 			$li = imagecreatefrompng($logo);
  83. 			$liw = imagesx($li);
  84. 			$lih = imagesy($li);
  85. 			
  86. 			$x = ($w-$liw)/2;
  87. 			$y = ($h-$lih)/2;
  88. 			
  89. 			$pad = 35;
  90. 			switch($p){
  91. 			    case 1:
  92. 					$x = 0+$pad;
  93. 					$y = 0+$pad;
  94. 				break;
  95. 				
  96. 				case 2:
  97. 					$y = 0+$pad;				
  98. 				break;
  99. 				
  100. 				case 3:
  101. 					$x = $w-$liw-$pad;
  102. 					$y = 0+$pad;
  103. 				break;
  104. 				
  105. 				case 4:
  106. 					$x = 0+$pad;
  107. 				break;
  108. 				
  109. 				case 6:
  110. 					$x = $w-$liw-$pad;
  111. 				break;
  112. 				
  113. 				case 7:
  114. 					$x = 0+$pad;
  115. 					$y = $h-$lih-$pad;
  116. 				break;
  117. 				
  118. 				case 8:
  119. 					$y = $h-$lih-$pad;
  120. 				break;
  121. 				
  122. 				case 9:
  123. 					$x = $w-$liw-$pad;
  124. 					$y = $h-$lih-$pad;
  125. 				break;	
  126. 			}
  127. 			imagecopy($ni,$li,$x,$y,0,0,$liw,$lih);
  128. 			if($f){
  129. 				imagejpeg($ni,$i);
  130. 			}else{
  131. 				$path = dirname($i).'/';
  132. 				$name = $fn.substr($i,strrpos($i,'/')+1);
  133. 				imagejpeg($ni,$path.$name);			
  134. 			}
  135. 			imagedestroy($ni);
  136. 			imagedestroy($li);
  137. 		}
  138. 	}
  139. }
  141. function txt($i,$s=30,$t='版权所有',$c='rand',$a=0,$p=5,$f=true,$fn='t_'){
  142. 	$font = dirname(__FILE__).'/f.ttf';
  143. 	$ii = getimagesize($i);
  144. 	if($ii[2]==2){
  145. 		if($ii[0]>300){
  146. 		    $ni = imagecreatefromjpeg($i);
  147. 			$pos = imagettfbbox($s,0,$font,$t);
  148. 			$pad = 30;
  149. 			switch($p){
  150. 				case 1://左上角
  151. 					$x = 0-$pos[0]+$pad;
  152. 					$y = 0-$pos[7]+$pad;
  153. 				break;
  154. 				
  155. 				case 2://上边 水平中央
  156. 					$x = ($ii[0]-$pos[2])/2;
  157. 					$y = 0-$pos[7]+$pad;
  158. 				break;
  159. 				
  160. 				case 3:
  161. 					$x = $ii[0]-$pos[2]-$pad;
  162. 					$y = 0-$pos[7]+$pad;
  163. 				break;
  164. 				
  165. 				case 4:
  166. 					$x = 0-$pos[0]+$pad;
  167. 					$y = ($ii[1]-$pos[6])/2;
  168. 				break;
  169. 				
  170. 				case 5:
  171. 					$x = ($ii[0]-$pos[2])/2;
  172. 					$y = ($ii[1]-$pos[6])/2;
  173. 				break;
  174. 				
  175. 				case 6:
  176. 					$x = $ii[0]-$pos[2]-$pad;
  177. 					$y = ($ii[1]-$pos[6])/2;
  178. 				break;
  179. 				
  180. 				case 7:
  181. 					$x = 0-$pos[0]+$pad;
  182. 					$y = $ii[1]-$pos[6]-$pad;
  183. 				break;
  184. 				
  185. 				case 8:
  186. 					$x = ($ii[0]-$pos[2])/2;
  187. 					$y = $ii[1]-$pos[6]-$pad;
  188. 				break;
  189. 				
  190. 				case 9:
  191. 				 	$x = $ii[0]-$pos[2]-$pad;
  192. 					$y = $ii[1]-$pos[6]-$pad;
  193. 				break;
  194. 			}
  195. 			imagettftext($ni,$s,0,$x,$y,gc($ni,$c,$a),$font,$t);
  197. 			if($f){
  198. 				imagejpeg($ni,$i);
  199. 			}else{
  200. 				$path = dirname($i).'/';
  201. 				$name = $fn.substr($i,strrpos($i,'/')+1);
  202. 				imagejpeg($ni,$path.$name);			
  203. 			}
  204. 			imagedestroy($ni);
  205. 		}
  206. 	}
  207. }
  209. function gc($i,$c='rand',$a=0){
  210. 	$color = '';
  211. 	switch($c){
  212. 	    case 'white':
  213. 			$color = imagecolorallocatealpha($i,255,255,255,$a);
  214. 		break;
  215. 	    case 'black':
  216. 			$color = imagecolorallocatealpha($i,0,0,0,$a);
  217. 		break;
  218. 		case 'red':
  219. 			$color = imagecolorallocatealpha($i,255,0,0,$a);
  220. 		break;
  221. 		case 'green':
  222. 			$color = imagecolorallocatealpha($i,0,255,0,$a);
  223. 		break;
  224. 		case 'rand':
  225. 			$color = imagecolorallocatealpha($i,mt_rand(0,255),mt_rand(0,255),mt_rand(0,255),$a);
  226. 		break;
  227. 		default:
  228. 		    $cc = str_split($c,2);
  229. 			$color = imagecolorallocatealpha($i,hexdec($cc[0]),hexdec($cc[1]),hexdec($cc[2]),$a);
  230. 		break;
  231. 	}
  232. 	return $color;
  233. }






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原文地址：https://www.cnblogs.com/lsr111/p/4523576.html